BL system setup, what's all needed

[T2693]

Get some video next time HotnCold, lol

K, I was looking over things and I'll be setting some things over over the next couple months so here's the questions

8 will work with 6 cells

9 will work with 7 cells

I currently have 2 6 cell packs so if I go with the 9 I can't use the 6 cell packs?

Between the titans and the 8 what will I notice? More speed? How much faster is the 9 over the 8?

Just trying to figure out what will be the best route for me.

Thanks